Disadvantages of Capacitive Transducer Due to high output impedance, a complicated measuring circuit at the output is needed. Fast response. Self-generating signal. Fast response Time to reach equilibrium conditions = 5t = 10s. This characteristic can be used in the measurement of displacement, force, and pressure. Resistive & Capacitive Transducers Presented To: Presented By: Overviews. The applications of transducers based on the electric parameter used and the principle involved is given below. DC response. It gives non linear behavior. It is very difficult to give the desired shape to this material and also desired strength Low sensitivity. The resistive transducers are available in various sizes and they have a considerably high amount of resistance. And this property of conductors is used for measuring the physical quantities of material. The frame of the capacitor requires earthing for reducing the effect of the stray magnetic field. Required fields are marked *. (iii) It needs to be calibrated regularly (iv) Strain gauges have to be applied manually. The resistive transducer can function as a potentiometer where the resistance of the transducer can be varied by changing the length of the. The following are the applications of the resistive transducer. Some of the major disadvantages of resistive transducers are: A lot of power is wasted in moving the sliding contacts. It is a passive transducer which required external source of supply to function. The measurement of capacitance is hard compare to measurement of resistance. Apart from the merits described above, some disadvantages do exist in electrical sensors. How long will it take for the transducer to read half of the temperature difference? Where R – resistance in ohms. ρ – the resistivity of the conductor in materials in ohm meter. Time constant t= 10/5 =2s. It is one of their biggest disadvantages The inductive transducers work on the principle of the magnetic induction of magnetic material. Both the AC and DC, current or voltage is appropriate for the measurement of variable resistance. Passive Type Transducers. Both the AC and DC, current or voltage is appropriate for the measurement of variable resistance. It is available in various sizes and having a high range of resistance. Difference Between CMOS and NMOS Technology, Difference between Inverting and Non-Inverting Amplifiers, What is a Programming Language and Different Types. 9AEI306.76 25 Disadvantages • Limited to moderate pressures • Float design should be considered for liquids with suspensions 26. Here, the resistance change can be calculated with the help of measuring devices like AC or DC. In silicon the piezoresistive effect is used in piezoresistors, transducers, piezo-FETS, solid state accelerometers and bipolar transistors. Disadvantages. It has rugged construction. Disadvantages of an Electrical transducer: The electrical transducer is sometimes less reliable than mechanical type because of the ageing and drift of the active components. A lot of power is wasted in moving the sliding contacts. Piezo-resistive. The change in resistance is measured by the ac or dc measuring devices. We can use both AC or DC for calculating the change in resistance. The capacitance pressure transmitter is a pressure measurement device, . Disadvantages: The capacitive transducers are temperature sensitive. The variation of resistance R with temperature t can be represented by the equation, Where α is the temperature co-efficient at t 0 and R 0 is the resistance at t 0. The disadvantages of piezoelectric transducers are: 1. It is affected by temperatures 3. The slider moves horizontally. To reduce the chances of the pickup, electrostatic screening must be given to these transducers. 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